Use what the apostles refer to as a “sound pattern of words.”
The Ten Commandments
The Apostles Creed
The Lord’s Prayer
Never should the Church be an innovator to deliver what caters to feelings. Christ delivers the benefits of His righteousness on our behalf with a Cross and the simple means of Word plus Water and Supper.
It is a Sunday School, so there are disciples who fall under discipline, which reverts back to a sound pattern of words. The patterns referenced above invite further exploration and pondering.
It is all good, because God is in Christ reconciling the world to Himself, not counting their trespasses against them, and He has committed to you the word of reconciliation.
I do hear what you are saying. Thank you, the prayers is a good start. See, I couldn’t even figure that out myself!